Why would you replace a working $33 board with one that costs over $180?
Langmuir developed their own controller board and added THC module to it. The THC implementation won’t work on a Gen1 system. And the software on the Gen2 system is proprietary (although appears to be GRBL based) and undocumented.
Having some ‘laying around’ makes more sense. I think you can buy a Z only upgrade for Gen1, but that would be a lot more expensive than simply adding your own Z Axis and then adapting your Duet controllers to control the three axis. I would highly recommend adding at Third party THC controller, eg THC3-T02, because the signal processing and voltage isolation need to do THC right is an Art. THC3-T02 did it right. IMO, LS did not.
There are a number of early posts on adding THC to an LS Plasma Cutter, they are a worthwhile read IMO.
THC is useful if you have warped material, thin material (less than 3/16") that tends to warp due to heat, or an early CF with the cantilevered X Rail, which tends to not move planar to the workpiece.
I had seen some of the open source THC controller projects the one I picked up came with the Razorweld Cut 45 CNC.
Thanks for the tip! I am going to be cutting parts for 3D printers and frame parts for mopeds in aluminum and steel. My first project is going to be a custom 5 gallon fuel tank for an Icebear Maddog that I designed in Fusion 360.
I was going to search through the forum to see if there were any fixes for known issues for this model and leave it stock until I have a better idea of what my workflow will be.
Any of the blowback type of Plasma Cutters can be used with a THC system if you’re willing to open up the unit and add wires directly to the Torch and Work Clamp connections. Some of the ‘CNC’ type of units bring the sense voltage out to a connector but with varying degrees of internal resistance that may or may not interfere with the accuracy of the read. The unit I mentioned, the THC3T-02 has a number of inputs so you can easily match the type of output from your Plasma Cutter.